### Skapa referens, olika format (klipp och klistra)

**Harvard**

Buttery, R., Gerhardt, S., Haye, R., Liu, Y., Reimerdes, H., Sabbagh, S., Chu, M., Osbone, T., Park, J., Pinsker, B., Strait, E. och Yu, J. (2011) *The Impact of 3-D Fields on Tearing Mode Stability of H-modes*.

** BibTeX **

@article{

Buttery2011,

author={Buttery, R. J. and Gerhardt, S. and Haye, R. J. La and Liu, Yueqiang and Reimerdes, H. and Sabbagh, S. and Chu, M. and Osbone, T. and Park, J.-K. and Pinsker, B. and Strait, E.J. and Yu, J.H.},

title={The Impact of 3-D Fields on Tearing Mode Stability of H-modes},

journal={Nuclear Fusion},

issn={0029-5515},

volume={51},

pages={073016},

abstract={New processes have been discovered in the interaction of 3D fields with tearing mode stability at low torque and modest β on DIII-D and NSTX. These are thought to arise from the plasma response at the tearing resonant surface, which theoretically is expected to depend strongly on plasma rotation and underlying intrinsic tearing stability. This leads to sensitivities additional to those previously identified at low density where the plasma rotation is more readily stopped, or at high βN where ideal MHD responses amplify the fields (where βN is the plasma β divided by the ratio of plasma current to minor radius multiplied by toroidal field). It is found that the threshold size for 3D fields to induce modes tends to zero as the natural tearing βN limit is approached. 3D field sensitivity is further enhanced at low rotation, with magnetic probing detecting an increased response to applied fields in such regimes. Modelling with the MARS-F code confirms the interpretation with the usual plasma screening response breaking down in low rotation plasmas and a tearing response developing, opening the door to additional sensitivities to β and the current profile. Typical field thresholds to induce modes in torque-free βN ~ 1.5 H-modes are well below those in ohmic plasmas or plasmas near the ideal βN limit. The strong interaction with the tearing mode βN limit is identified through rotation shear, which is decreased by the 3D field, leading to decreased tearing stability. Thus both locked and rotating mode field thresholds can be considered in terms of a torque balance, with sufficient braking leading to destabilization of a mode. On this basis new measurements of the principal parameter scalings for error field threshold have been obtained in torque-free H-modes leading to new predictions for error field sensitivity in ITER. The scalings have similar exponents to ohmic plasmas, but with seven times lower threshold at the ITER baseline βN value of 1.8, and a linear dependence on proximity to the tearing mode βN limit (~2.2 at zero torque). This reinforces the need to optimize error field correction strategies in ITER, and implement sources to drive plasma rotation.},

year={2011},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 150079

A1 Buttery, R. J.

A1 Gerhardt, S.

A1 Haye, R. J. La

A1 Liu, Yueqiang

A1 Reimerdes, H.

A1 Sabbagh, S.

A1 Chu, M.

A1 Osbone, T.

A1 Park, J.-K.

A1 Pinsker, B.

A1 Strait, E.J.

A1 Yu, J.H.

T1 The Impact of 3-D Fields on Tearing Mode Stability of H-modes

YR 2011

JF Nuclear Fusion

SN 0029-5515

VO 51

AB New processes have been discovered in the interaction of 3D fields with tearing mode stability at low torque and modest β on DIII-D and NSTX. These are thought to arise from the plasma response at the tearing resonant surface, which theoretically is expected to depend strongly on plasma rotation and underlying intrinsic tearing stability. This leads to sensitivities additional to those previously identified at low density where the plasma rotation is more readily stopped, or at high βN where ideal MHD responses amplify the fields (where βN is the plasma β divided by the ratio of plasma current to minor radius multiplied by toroidal field). It is found that the threshold size for 3D fields to induce modes tends to zero as the natural tearing βN limit is approached. 3D field sensitivity is further enhanced at low rotation, with magnetic probing detecting an increased response to applied fields in such regimes. Modelling with the MARS-F code confirms the interpretation with the usual plasma screening response breaking down in low rotation plasmas and a tearing response developing, opening the door to additional sensitivities to β and the current profile. Typical field thresholds to induce modes in torque-free βN ~ 1.5 H-modes are well below those in ohmic plasmas or plasmas near the ideal βN limit. The strong interaction with the tearing mode βN limit is identified through rotation shear, which is decreased by the 3D field, leading to decreased tearing stability. Thus both locked and rotating mode field thresholds can be considered in terms of a torque balance, with sufficient braking leading to destabilization of a mode. On this basis new measurements of the principal parameter scalings for error field threshold have been obtained in torque-free H-modes leading to new predictions for error field sensitivity in ITER. The scalings have similar exponents to ohmic plasmas, but with seven times lower threshold at the ITER baseline βN value of 1.8, and a linear dependence on proximity to the tearing mode βN limit (~2.2 at zero torque). This reinforces the need to optimize error field correction strategies in ITER, and implement sources to drive plasma rotation.

LA eng

LK http://iopscience.iop.org/0029-5515/51/7/073016

OL 30